1,4-oxazinone derivatives

ABSTRACT

1,4-oxazinone derivatives of the structure: ##STR1## wherein one of R and R 1  is hydrogen and the other is --CH 2  CO 2  R 6  (R 6  ═alkyl) or R and R 1  together represent the group ═CHCO 2  R 6 , R 2  and R 3  are hydrogen, alkyl, substituted alkyl, phenyl or substituted phenyl or R 2  and R 3  together represent a single adamantyl group, and R 4  and R 5  are hydrogen, alkyl, substituted alkyl, phenyl, substituted phenyl, or benzyl, are disclosed herein.

This is a division of co-pending application Ser. No. 647,787, filed Sept. 6, 1984, now U.S. Pat. No. 4,549,014.

FIELD OF THE INVENTION

This invention relates to new 1,4-oxazinone derivatives. More particularly, it relates to derivatives of 3,4,5,6-tetrahydro-1,4-oxazin-2-one. These derivatives, when tested, were found to have antimicrobial activity against N. gonorrehoeae or anti-inflammatory activity against carrageenan-induced edema in a laboratory animal model.

STATEMENT OF THE INVENTION

Accordingly, this invention is a 1,4-oxazinone derivative of the formula ##STR2## wherein one of R and R¹ is hydrogen and the other represents the group --CH₂ CO₂ R⁶ or together R and R¹ represent the group ═CHCO₂ R⁶ where R⁶ is alkyl, one of R² and R³ is hydrogen and the other is alkyl, substituted alkyl, phenyl or substituted phenyl or R² and R³ together represent a single adamantyl group, and R⁴ and R⁵ are hydrogen, alkyl, substituted alkyl, phenyl or substituted phenyl, or benzyl.

DETAILED DESCRIPTION OF INVENTION

The compounds of this invention are 3,4,5,6-tetrahydro-1,4-oxazin-2-one derivatives wherein the substituent groups, as shown in the above structural formula, are designated R through R⁵.

It is preferred that R and R¹ represent the group ═CHCO₂ R⁶ where R⁶ is a lower alkyl radical (C₁ -C₈) but one of R and R¹ may also be hydrogen while the other must then be --CH₂ CO₂ R⁶. R⁶ may have up to about 30 carbons, but preferably less than four carbons.

The alkyl radicals of R² and R³ have up to thirty carbon atoms, preferably up to eight and more preferably less than four carbon atoms. The alkyl portion of the substituted alkyl radicals of R² and R³ also has up to 30 carbon atoms, but preferably less than four. The substituents of these alkyl radicals are, for example, hydroxy, and alkanoyloxy groups. Alternatively, R² and R³ together represent a single adamantyl group. In particular, R² and R³ represent the adamantyl substituent of a compound of the following formula: ##STR3##

The aromatic radicals which are represented by R²⁻⁵ are, for example, phenyl and benzyl.

R⁴ and R⁵ are preferably hydrogen, alkyl radicals having less than four carbon atoms that may be substituted with a hydroxyl group, or a benzyl group.

The above mentioned alkyl radicals for R through R⁶ are either straight or branch chained. Examples of these include methyl, ethyl, propyl, isopropyl, isobutyl, butyl, pentyl, isopentyl, hexyl, octyl, isooctyl, decyl, dodecyl, octadecyl, eicosanoyl, tricosanoyl, hexacosanoyl, triacontanoyl and the like.

In general, the 1,4-oxazinones of this invention may be prepared by reacting a dialkyl (C₁ -C₈) acetylenedicarboxylate with a compound having both amino and hydroxy substituent groups which will condense with the acetylene compound to form the corresponding 1,4-oxazinone derivative. The aminoalcohol reactant is preferably dissolved in a suitable inert organic solvent, for example, a lower alkanol, ether, alkyl acetate, alkane or mixtures of these. The reaction is usually carried out with reactants employed in equimolar amounts, at ambient temperature and atmospheric pressure but may be run at temperatures ranging from about 15° to 80° C.

EXAMPLES

The following examples are used to show the preparation of representative compounds of this invention.

EXAMPLE 1

3-(Methoxycarbonyl)methylene-spiro[3,4,5,6-tetrahydro-1,4-oxazin-2-one-6,2'-tricyclo[3.3.1.1³,7 ]decane] was prepared as follows: 2-aminomethyl-2-hydroxyadamantane (2.70 g, 0.015 mol) was dissolved in 40 ml of anhydrous ethanol. After stirring for several minutes at room temperature, the solution was treated dropwise with 1.84 ml (0.015 mol) of dimethyl acetylenedicarboxylate. The reaction mixture was stirred at room temperature for 21/4 hours, then the solvent was removed in vacuo to leave 3.3 g (77%) of the desired 1,4-oxazinone derivative. Mp 227°-229° C. (ethanol).

Anal. Calcd. for C₁₆ H₂₁ NO₄ : C, 65.96; H, 7.26; N, 4.81. Found: C, 65.80; H, 7.44; N, 4.85.

The above prepared derivative was reduced as follows to form 3-(methoxycarbonyl)methyl-spiro[3,4,5,6-tetrahydro-1,4-oxazin-2-one-6,2'-tricyclo[3.3.1.1³,7 ]decane. The derivative (13.0 g) was dissolved in acetic acid and hydrogenated in a Parr apparatus over 2.62 g platinum oxide. The hydrogenation was run at room temperature for 21/2 hours at pressure that did not exceed 1 atm. After workup and recrystallization from methanol, 8.80 g of the pure 3-(methoxycarbonyl)methyl analog was obtained. Mp 103°-107° C.

Anal. Calcd. for C₁₆ H₂₃ NO₄ : C, 65.51; H, 7.90; N, 4.77. Found: C, 64.55; H, 7.53; N, 4.72.

EXAMPLE 2

5,5-Dimethyl-3-(methoxycarbonyl)methylene-3,4,5,6-tetrahydro-1,4-oxazin-2-one was prepared as follows: 2-amino-2-methyl-1-propanol (5.35 ml, 0.056 mol) was dissolved in 100 ml of anhydrous ethanol. Dimethyl acetylenedicarboxylate (7.20 ml, 0.056 mol) was added dropwise at a rate which caused the solution to mildly reflux. Then, the reaction mixture was stirred at ambient temperature for 2 hours, and the solvent was evaporated to yield the desired 1,4-oxazinone derivative. After recrystallization from ethanol, 5.79 g of pure product was obtained melting at 94°-97° C.

Anal. Calcd. for C₉ H₁₃ NO₄ : C, 54.26; H, 6.58; N, 7.03. Found: C, 54.42; H, 6.39; N, 6.96.

EXAMPLES 3-12

The following analogs of the 1,4-oxazinone derivative of Example 2 were prepared in a manner similar to the procedure used in Example 2. By reacting dimethyl acetylenedicarboxylate with 2-hydroxypropylamine, 2-amino-1-ethanol, 3-amino-2-hydroxy-1-propanol, 2-amino-1-phenyl-1-propanol, 2-amino-1-phenyl-1-ethanol, 2-amino-2-hydroxymethyl-1-propanol, 2-amino-3-phenyl-1-propanol, 2-amino-1-butanol, and 2-amino-3-methyl-1-butanol, in place of 2-amino-2-methyl-1-propanol of Example 2 the following compounds of Examples 3-12 were prepared:

EXAMPLE 3

6-methyl-3-(methoxycarbonyl)methylene-3,4,5,6-tetrahydro-1,4-oxazin-2-one. The recrystallization solvent was ethanol and the melting point was 98°-101° C.

Anal. Calcd. for C₈ H₁₁ NO₄ : C, 51.89; H, 5.99; N, 7.56. Found: C, 51.86; H, 5.99; N, 7.56.

EXAMPLE 4

3-(methoxycarbonyl)methylene-3,4,5,6-tetrahydro-1,4-oxazin-2-one. The recrystallization solvent was ethanol and the melting point was 76°-79° C.

Anal. Calcd. for C₇ H₉ NO₄ : C, 49.12; H, 5.30; N, 8.18. Found: C, 48.76; H, 5.32; N, 8.04.

EXAMPLE 5

6-hydroxymethyl-3-(methoxycarbonyl)methylene-3,4,5,6-tetrahydro-1,4-oxazin-2-one. The recrystallization solvent was ethanol and the melting point was 112°-114° C.

Anal. Calcd. for C₈ H₁₁ NO₅ : C, 47.76; H, 5.51; N, 6.96. Found: C, 47.93; H, 5.55; N, 6.95.

EXAMPLE 6

5-methyl-6-phenyl-(3-methoxycarbonyl)methylene-3,4,5,6-tetrahydro-1,4-oxazin-2-one. The recrystallization solvent was diethyl ether and the melting point was 117° C.

Anal. Calcd. for C₁₄ H₁₅ NO₄ : C, 64.36; H, 5.79; N, 5.36. Found: C, 64.29; H, 5.82; N, 5.40.

EXAMPLE 7

6-phenyl-3-(methoxycarbonyl)methylene-3,4,5,6-tetrahydro-1,4-oxazin-2-one. The recrystallization solvent was ethanol and the melting point was 125°-126° C.

Anal. Calcd. for C₁₃ H₁₃ NO₄ : C, 63.15; H, 5.30; N, 5.66. Found: C, 63.02; H, 5.44; N, 5.61.

EXAMPLE 8

5-hydroxymethyl-5-methyl-3-(methoxycarbonyl)methylene-3,4,5,6-tetrahydro-1,4-oxazin-2-one. The recrystallization solve was hexane and the melting point was 62°-63° C.

Anal. Calcd. for C₉ H₁₃ NO₅ : C, 50.23; H, 6.09; N, 6.51. Found: C, 50.60; H, 6.30; N, 6.52.

EXAMPLE 9

5-benzyl-3-(methoxycarbonyl)methylene-3,4,5,6-tetrahydro-1,4-oxazin-2-one. The recrystallization solvent was hexane and t melting point was 82°-83° C.

Anal. Calcd. for C₁₄ H₁₅ NO₄ : C, 64.36; H, 5.79; N, 5.36. Found: C, 64.56; H, 5.93; N, 5.35.

EXAMPLE 10

5-ethyl-3-(methoxycarbonyl)methylene-3,4,5,6-tetrahydro-1,4-oxazin-2-one. The recrystallization solvent was hexane:ethylacetate (1:1) and the melting point was 68°-70° C.

Anal. Calcd. C₉ H₁₃ NO₄ : C, 54.26; H, 6.59; N, 7.03. Found: C, 54.11; H, 6.37; N, 7.04.

EXAMPLE 11

5-isopropyl-3-(methoxycarbonyl)methylene-3,4,5,6-tetrahydro-1,4-oxazin-2-one. This material was a viscous oil. 

We claim:
 1. A 1,4-oxazinone derivative of the formula ##STR4## wherein R and R¹ together represent the group ═CHCO₂ R⁶ where R⁶ is alkyl, R² and R³ are hydrogen or phenyl, and R⁴ and R⁵ are hydrogen, alkyl or benzyl, provided that when both R² and R³ are hydrogen, at least one of R⁴ and R⁵ is benzyl and when R⁴ and R⁵ are either hydrogen or alkyl, at least one of R² and R³ is phenyl.
 2. The derivative of claim 1 wherein R² and R³ are hydrogen.
 3. The derivative of claim 1 wherein one of R² and R³ is hydrogen and the other is phenyl.
 4. The derivative of claim 1 wherein R⁴ and R⁵ are hydrogen, alkyl or benzyl.
 5. The derivative of claim 1 wherein one of R⁴ and R⁵ is hydrogen and the other is alkyl or benzyl.
 6. The derivative of claim 4 wherein R⁴ and R⁵ are hydrogen.
 7. The derivative of claim 4 wherein R⁴ and R⁵ are alkyl radicals having less than 4 carbon atoms.
 8. The derivative of claim 5 wherein one of R⁴ and R⁵ is hydrogen and the other is benzyl. 